[Mark_C]

The build week code is just a representation of the week the car was scheduled to be built, didn't have anything to do with special orders or anything like that. The 04L may be just a typo that went on for a few days, or it may mean something. Maybe someday someone will figure it out.

Body numbers are assigned as the orders were approved by GM for construction. That means the dealer submitted them to the Zone, the Zone checked to make sure there were no incorrect combinations or discontinued options etc If there were they went back to the dealer for correction and resubmittal. Once they were correct the order was sent to the Factory for Scheduling. At this point the body number (BDY on the cowl tag) was assigned to the car. The number was sent back to the dealer as order confirmation and from then on this was the only number used to track the car until it was built and delivered to the GM side of the plant.


The cars start out on Fishers side with only the body number
identifying it and they start out in a random order based on the options and color combinations available at that time.

The VIN's are assigned in the order the cars are received at the GM "hole in the wall" from Fisher. So if the cars start out in a random order based on the availability of parts the body numbers when compared to the VIN will jump around quite a bit.

That's why looking at a body number is not always a good indicator of when the car was built or whether it matches a certain VIN, at least in 69. You can make generalizations only.